Ultra-high-strength precipitation-hardenable stainless steel...

C - Chemistry – Metallurgy – 22 – C

Patent

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Details

C22C 38/52 (2006.01) C21D 6/02 (2006.01) C21D 6/04 (2006.01) C22C 38/00 (2006.01) C22C 38/06 (2006.01) C22C 38/44 (2006.01) C22C 38/54 (2006.01) C21D 6/00 (2006.01) C21D 8/00 (2006.01) C21D 8/02 (2006.01)

Patent

CA 2442068

A precipitation hardeanble stainless steel having the following weight percent composition is disclosed. C 0.030 max. Mn 0.5 max. Si 0.5 max. P 0.040 max. S 0.025 max. Cr 9-13 Ni 7-9 Mo 3-6 Cu 0.75 max. Co 5-11 Ti 1.0 max. Al 1.0-1.5 Nb 1.0 max. B 0.010 max. N 0.030 max. O 0.020 max. The balance of the alloy is essentially iron and the usual impurities. One or more rare earth metals or calcium may be included in the alloy for removing and/or stabilizing phosphorus and sulfur. The alloy provides a unique combination of strength, toughness, and ductility. There is described a useful article such as an aircraft structural component or a golf club head that is formed, at least in part, from the aforesaid alloy. In accordance with a further aspect of the invention, there is an elongated strip formed from the aforesaid stainless steel.

L'invention concerne un acier inoxydable durcissable par précipitation ayant la composition en pourcentage en poids suivante : 0.030 maxi de C ; 0.5 maxi de Mn ; 0.5 maxi de Si ; 0.040 maxi de P ; 0.025 maxi de S ; 9-13 de Cr ; 7-9 de Ni ; 3-6 de Mo ; 0.75 maxi de Cu ; 5-11 de Co ; 1.0 maxi de Ti ; 1.0-1.5 de Al ; 1.0 maxi de Nb ; 0.010 maxi de B ; 0.030 maxi de N ; 0.020 maxi de O. Le complément de cet alliage étant sensiblement du fer et les impuretés usuelles. Au moins un métal de terre rare ou du calcium peut être inclus dans l'alliage pour enlever et/ou stabiliser le phosphore et le soufre. L'alliage procure une association unique de résistance, de ténacité et de ductilité. L'invention concerne un article utile tel qu'un composant structurel d'aéronef ou une tête de club de golf réalisé(e), au moins en partie, dans l'alliage cité. Selon un autre aspect de l'invention, une bande allongée est réalisée dans l'acier inoxydable cité.

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